As explained in
another Generative Art article,
the origin of Gliftic, now called Gliftex, was in an idea for describing
an image as composed of three parts, the form, the color scheme and the
interpretation. Add to this the ability to breed images and you have a
real abstract image generator. Here are some examples:

You can tile the
images to make endless repeats. There is a demo
version here. The PRO version has PostScript output and you get a
tool well able to create high quality designs.